Liquid discharge device

Abstract

To suppress occurrence of a crease in a medium.SOLUTION: A liquid discharge device 1 includes: a liquid discharge section 5 which discharges liquid to a medium M; a winding section 6 which winds the medium M while applying tensile force in a conveying direction A; a medium support section 3C which supports the medium M by a supporting surface 30 on the downstream side in the conveying direction A of the liquid discharge section 5 and on the upstream side in the conveying direction A of the winding section 6; and a contact member 100 which guides conveyance of the medium M while being brought into contact with at least a part of the medium M wound by the winding section 6 on a contact surface 101 on the downstream side in the conveying direction A of the medium support section 3C and on the upstream side in the conveying direction A of the winding section 6 and is curved so that the contact surface 101 protrudes viewed from a width direction B. A downstream side bent section 32 is formed to be curved so that the support surface 30 protrudes viewed from the width direction B on the downstream side of the central section 33 in the conveying direction A of the medium support section 3C. The medium M is conveyed by being stretched from the downstream side bent section 32 to the contact member 100.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a liquid ejection device.

Background Art

[0002] Conventionally, various liquid ejection devices have been used. Among them, there is a liquid ejection device including a liquid ejection unit that ejects liquid onto a medium, a winding unit that winds up the medium, and a medium support unit that supports the medium at a position between the liquid ejection unit and the winding unit in the conveyance direction of the medium. For example, Patent Document 1 discloses a recording device including a recording unit that ejects ink onto a medium, a winding unit that winds up the medium, and a medium support unit that supports the medium at a position between the recording unit and the winding unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a conventional liquid ejection device including a liquid ejection unit, a winding unit, and a medium support unit, such as the recording device of Patent Document 1, wrinkles may occur in the medium when the medium is wound up by the winding unit. Therefore, Patent Document 1 describes forming a bent portion so that the side of the medium support unit that contacts the medium is convex, suppressing the occurrence of wrinkles in the medium being handled at the bent portion and preventing the formation of creases, and setting the bending angle of the bent portion to 3° or more and 16° or less. Here, even if wrinkles occur in the medium, the wrinkles can be made less likely to form creases by being handled at the bent portion. However, if the bending angle of the bent portion is too large, the surface pressure becomes too large due to the medium bending at a sharp angle, and the wrinkles are likely to become creases. On the other hand, if the bending angle of the bent portion is too small, the surface pressure is too small, the effect of handling the wrinkles is reduced, the wrinkles are less likely to be dispersed in the width direction, and the wrinkles are likely to become creases.

[0005] Further, depending on the type of the medium used and the amount of the liquid ejected, streaks may easily occur in the medium. Further, for example, if the support surface of the medium support portion is set at an angle close to the horizontal direction with respect to the installation surface of the liquid ejection device in order to reduce the height of the entire liquid ejection device, the medium conveyed from the support surface toward the winding portion is likely to be configured to bend at a sharp angle, the surface pressure applied to the medium increases, and streaks are likely to occur in the medium. Therefore, a technique for further suppressing the occurrence of streaks in the medium is desired.

Means for Solving the Problems

[0006] A liquid ejection device of the present invention for solving the above problems includes a liquid ejection unit that ejects liquid onto a medium, a winding unit that winds the medium while applying tension in the conveyance direction, a medium support unit that supports the medium on a support surface downstream of the liquid ejection unit in the conveyance direction and upstream of the winding unit in the conveyance direction, and a contact member that guides the conveyance of the medium while contacting at least a part of the medium wound around the winding unit at a contact surface, and the contact surface is curved so as to protrude when viewed from a width direction intersecting the conveyance direction, downstream of the central portion of the medium support unit in the conveyance direction, a downstream bending portion is formed in which the support surface is curved so as to protrude when viewed from the width direction, and the medium is conveyed across from the downstream bending portion to the contact member.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0008] First, the present invention will be schematically described. A liquid ejection device according to a first aspect of the present invention for solving the above problems includes a liquid ejection unit that ejects liquid onto a medium, a winding unit that winds up the medium while applying tension in the conveyance direction, a medium support unit that supports the medium on a support surface downstream of the liquid ejection unit in the conveyance direction and upstream of the winding unit in the conveyance direction, and a contact member that guides the conveyance of the medium while contacting at least a part of the medium wound around the winding unit at a contact surface, and the contact surface is curved so as to protrude when viewed from a width direction intersecting the conveyance direction, and is provided downstream of a central portion of the medium support unit in the conveyance direction, a downstream bending portion is formed such that the support surface protrudes when viewed from the width direction, and the medium is conveyed across from the downstream bending portion to the contact member.

[0009] According to this aspect, a contact member is provided at a position between the medium support unit and the winding unit in the conveyance direction of the medium, a downstream bending portion is formed downstream of a central portion of the medium support unit in the conveyance direction, and the medium is conveyed across from the downstream bending portion to the contact member. With such a configuration, wrinkles generated in the medium can be effectively smoothed at the downstream bending portion, and moreover, since the surface pressure applied to the medium is dispersed between the downstream bending portion and the contact member, it is possible to suppress the occurrence of creases in the medium.

[0010] A liquid ejection device according to a second aspect of the present invention is an aspect dependent on the first aspect, and is characterized in that an upstream bending portion is formed upstream of the downstream bending portion of the medium support unit in the conveyance direction, and the support surface is curved so as to protrude when viewed from the width direction.

[0011] According to this aspect, an upstream bending portion is formed upstream of the downstream bending portion of the medium support unit in the conveyance direction, and the support surface is curved so as to protrude when viewed from the width direction. Therefore, in addition to the downstream bending portion, the upstream bending portion can also smooth wrinkles generated in the medium, and it is possible to effectively suppress the occurrence of creases in the medium.

[0012] The liquid ejection device according to the third aspect of the present invention is an aspect dependent on the second aspect, and when the bending angle of the upstream bending portion as viewed from the width direction is Θ1 and the bending angle of the downstream bending portion as viewed from the width direction is Θ2, it is characterized in that Θ1 > Θ2.

[0013] According to this aspect, when the bending angle of the upstream bending portion as viewed from the width direction is Θ1 and the bending angle of the downstream bending portion as viewed from the width direction is Θ2, Θ1 > Θ2. By adopting such a configuration, wrinkles generated in the medium at the downstream bending portion and the upstream bending portion can be effectively flattened, and the occurrence of creases in the medium can be particularly effectively suppressed.

[0014] The liquid ejection device according to the fourth aspect of the present invention is an aspect dependent on the second or third aspect, and when the length of the upstream bending portion in the conveyance direction is L1 and the length of the downstream bending portion in the conveyance direction is L2, it is characterized in that L1 > L2.

[0015] According to this aspect, when the length of the upstream bending portion in the conveyance direction is L1 and the length of the downstream bending portion in the conveyance direction is L2, L1 > L2. By adopting such a configuration, wrinkles generated in the medium at the downstream bending portion and the upstream bending portion can be effectively flattened, and the occurrence of creases in the medium can be particularly effectively suppressed.

[0016] The liquid ejection device according to the fifth aspect of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the contact member is supported by the medium support portion.

[0017] According to this aspect, the contact member is supported by the medium support portion. By adopting such a configuration, the contact member can be arranged at a suitable position with respect to the medium support portion with a simple configuration.

[0018] The liquid ejection device according to the sixth aspect of the present invention is an aspect dependent on the first or second aspect, and is characterized in that the medium support portion includes a heater for heating the medium.

[0019] According to this aspect, the medium support part includes a heater for heating the medium. With such a configuration, the liquid applied to the medium in the medium support part can be evaporated in a short time, thereby suppressing the swelling of the medium. For this reason, the possibility of wrinkles occurring in the medium in the medium support part can be reduced, and the occurrence of creases in the medium can be effectively suppressed.

[0020] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. First, with reference to FIG. 1, an overview of a liquid ejection device 1 according to an embodiment of the present invention will be described. In FIG. 1, some constituent members are shown in a simplified and omitted manner for easy understanding of the configuration. Here, the X-axis direction in the figure is the horizontal direction and is the direction in which the support part of the holding part 2 that holds the roll body R1 in which the medium M is wound in a roll shape extends, the Y-axis direction is the horizontal direction and is the front-rear direction of the liquid ejection device 1 and is a direction orthogonal to the X-axis direction, and the Z-axis direction is the vertical direction. Also, hereinafter, the direction in which the arrow points is the + direction, and the direction opposite to the direction in which the arrow points is the - direction. For example, the vertically upward direction is the +Z direction, the vertically downward direction is the -Z direction, the front of the liquid ejection device 1 is the +Y direction, and the rear of the liquid ejection device 1 is the -Y direction.

[0021] The liquid ejection device 1 of this embodiment includes a main body part 9, and leg frames 7 are attached to the vicinity of both ends of the main body part 9 in the X-axis direction. Further, the liquid ejection device 1 of this embodiment includes a holding part 2 that holds a roll body R1 in which the medium M is wound in a roll shape on the -Y direction side, which is the rear side of the main body part 9. The holding part 2 serves as a feeding part that feeds the medium M from the roll body R1 to the main body part 9.

[0022] And in the liquid ejection device 1 of the present embodiment, when the medium M is conveyed in the conveyance direction A, the holding part 2 serving as a rotation axis along the X-axis direction rotates in the rotation direction C. The holding part 2 is a member inserted into a paper tube which is the core of the roll body R1. In FIG. 1, the roll body R1 wound so that the image forming surface M1 on which an image is formed faces outward is used. However, when the roll body R1 wound so that the image forming surface M1 faces inward is used, the holding part 2 can rotate in the direction opposite to the rotation direction C to send out the medium M from the roll body R1.

[0023] Further, the liquid ejection device 1 of the present embodiment includes a conveyance path of the medium M including a medium support part 3 that supports the medium M on the support surface 30 and the like. The liquid ejection device 1 of the present embodiment includes, as the medium support part 3, an upstream medium support part 3A, a medium support part 3B, and a downstream medium support part 3C from the upstream side to the downstream side in the conveyance direction A. Further, the liquid ejection device 1 includes a pair of rollers 8 including a drive roller and a driven roller as a conveyance part for conveying the medium M in the conveyance direction A in the conveyance path. However, the configuration of the conveyance part is not particularly limited.

[0024] Further, the liquid ejection device 1 of the present embodiment includes a head 5 as a liquid ejection part that is provided with a plurality of nozzles at a position facing the medium support part 3B and ejects ink, which is a liquid, from the nozzles to form an image, and a carriage 4 that mounts the head 5 and is reciprocally movable in the width direction B. In the liquid ejection device 1 of the present embodiment, the conveyance direction A at the position facing the head 5 on the medium support part 3B is the +Y direction, the width direction B which is the moving direction of the head 5 is a direction along the X-axis direction, and the ink ejection direction is the -Z direction.

[0025] With the above configuration, the head 5 can form an image by discharging ink from a nozzle (not shown) onto the medium M being conveyed while reciprocating in the width direction B, which is a direction intersecting the conveyance direction A. The liquid ejection device 1 of the present embodiment can form a desired image on the medium M by repeating the steps of conveying the medium M in the conveyance direction A at a predetermined conveyance amount and discharging ink while moving the head 5 in the width direction B with the medium M stopped.

[0026] Further, a heater 20 is provided as a heating unit for heating the supported surface M2 on the side opposite to the image formation surface M1 of the medium M in the downstream medium support portion 3C of the medium support portion 3. The heater 20 of the present embodiment is composed of a heating wire or the like, but is not limited to such a configuration. Also, not only the downstream medium support portion 3C but also the upstream medium support portion 3A and the medium support portion 3B may be provided with a medium heating unit for heating the supported surface M2 on the side opposite to the image formation surface M1 of the medium M.

[0027] Further, a blower unit 10 is provided at a portion of the conveyance path facing the downstream medium support portion 3C for drying the ink discharged from the head 5 onto the image formation surface M1 of the medium M by blowing an air flow F. The blower unit 10 of the present embodiment includes a fan 11 that generates the air flow F and is configured to be able to blow the gas as the air flow F onto the image formation surface M1 of the medium M, but is not limited to such a configuration.

[0028] Further downstream of the downstream-side medium support portion 3C in the conveyance direction A, a holding portion 6 is provided as a winding portion that winds the medium M conveyed in the conveyance direction A into a roll shape to form a roll body R2. In the liquid ejection apparatus 1 of the present embodiment, the holding portion 2 and the holding portion 6 have the same configuration, and the holding portion 6 rotates in the rotation direction C. The medium M conveyed from the holding portion 2 to the holding portion 6 is conveyed in a state where a predetermined tension is applied by the holding portion 6 or the like. The holding portion 6 is a member into which a paper tube, which is the winding core of the roll body R2, is inserted. In FIG. 1, the holding portion 6 rotates in the rotation direction C so that the image formation surface M1 is wound to the outside, but the medium M may be wound so that the image formation surface M1 is on the inside. In that case, the holding portion 6 rotates in the direction opposite to the rotation direction C.

[0029] Note that a guide bar 100 is provided between the downstream-side medium support portion 3C and the holding portion 6 in the conveyance direction A. The guide bar 100 has an arcuate contact surface 101 when viewed from the width direction B. In other words, the guide bar 100 has a contact surface 101 that curves so as to protrude when viewed from the width direction B. Then, the guide bar 100 guides the conveyance of the medium M by the contact surface 101 coming into contact with the supported surface M2 of the medium M wound around the holding portion 6. As the winding diameter of the roll body R2 formed by winding the medium M in the holding portion 6 changes, the angle of the conveyance direction A with respect to the holding portion 6 when viewed from the width direction B changes. Therefore, in the member that contacts the medium M immediately before the holding portion 6 upstream in the conveyance direction A, the contact state with the medium M fluctuates. The liquid ejection apparatus 1 of the present embodiment arranges the guide bar 100 immediately before the holding portion 6 upstream in the conveyance direction A, so that the contact state between the downstream-side medium support portion 3C located upstream of the guide bar 100 and the medium M does not fluctuate. The guide bar 100 only needs to guide the conveyance of the medium M while contacting at least a part of the supported surface M2 of the medium M wound around the holding portion 6 at the contact surface 101, and it is not necessary to contact the entire supported surface M2 of the medium M.

[0030] As described above, the liquid ejection apparatus 1 of the present embodiment includes a head 5 that ejects ink, which is a liquid, onto a medium M, a holding unit 6 that winds up the medium M while applying tension in the conveyance direction A, and a downstream-side medium support unit 3C that supports the medium M on a support surface 30 downstream of the head 5 in the conveyance direction A and upstream of the holding unit 6 in the conveyance direction A. Further, the liquid ejection apparatus 1 of the present embodiment includes a guide bar 100 as a contact member that guides the conveyance of the medium M while contacting at least a part of the medium M wound around the holding unit 6 at a contact surface 101, downstream of the downstream-side medium support unit 3C in the conveyance direction A and upstream of the holding unit 6 in the conveyance direction A, and is curved such that the contact surface 101 protrudes when viewed from the width direction B intersecting the conveyance direction A. Hereinafter, the details of the downstream-side medium support unit 3C, which is a main part of the liquid ejection apparatus 1 of the present embodiment, will be described mainly with reference to FIG. 2, including the relationship with the guide bar 100.

[0031] As shown in FIG. 2, in the downstream-side medium support unit 3C of the liquid ejection apparatus 1 of the present embodiment, a region including the central portion 33 in the conveyance direction A of the support surface 30 is a flat region. An upstream-side bent portion 31 is formed upstream of the flat region in the conveyance direction A and is curved such that the support surface 30 protrudes when viewed from the width direction B, and a downstream-side bent portion 32 is formed downstream of the flat region in the conveyance direction A and is curved such that the support surface 30 protrudes when viewed from the width direction B. The upstream-side bent portion 31 extends over the upstream end portion of the support surface 30 in the downstream-side medium support unit 3C, and the downstream-side bent portion 32 extends over the downstream end portion of the support surface 30 in the downstream-side medium support unit 3C.

[0032] As described above, the liquid ejection device 1 of this embodiment includes a guide bar 100 at a position between the downstream medium support portion 3C and the holding portion 6 in the conveyance direction A of the medium M. A downstream bending portion 32 is formed downstream of the central portion 33 in the conveyance direction A of the downstream medium support portion 3C. As shown in FIG. 1, the medium M is configured to be conveyed across from the downstream bending portion 32 to the guide bar 100. In other words, the downstream bending portion 32 and the guide bar 100 can prevent the bending angle of the medium M as viewed from the width direction B from becoming too large. Further, the range in which the medium M is pressed by the tension applied to the medium M straddles the downstream bending portion 32 and the guide bar 100, and the area where the pressed medium M is supported increases, so that the surface pressure applied to the medium M is dispersed. Therefore, it is possible to suppress the situation where the surface pressure applied to the medium M becomes too large and wrinkles are likely to form along the creases.

[0033] With such a configuration, the liquid ejection device 1 of this embodiment can effectively flatten the wrinkles generated in the medium M at the downstream bending portion 32 and suppress the formation of creases in the medium M. By effectively flattening the wrinkles generated in the medium M in this way, it is also possible to suppress the so-called winding deviation in which the medium M is wound with a deviation in the width direction B when the medium M is wound by the holding portion 6.

[0034] Also, as described above, in the liquid ejection device 1 of this embodiment, an upstream bending portion 31 is formed upstream of the downstream bending portion 32 of the downstream medium support portion 3C in the conveyance direction A and is curved so that the support surface 30 protrudes as viewed from the width direction B. For this reason, the liquid ejection device 1 of this embodiment can flatten the wrinkles generated in the medium M also at the upstream bending portion 31 in addition to the downstream bending portion 32, and can effectively suppress the formation of creases in the medium M.

[0035] Here, as shown in FIG. 2, when the bending angle of the upstream bending portion 31 as viewed from the width direction B is Θ1 and the bending angle of the downstream bending portion 32 as viewed from the width direction B is Θ2, it is preferably configured such that Θ1 > Θ2. With such a configuration, in the upstream bending portion 31, wrinkles are roughly leveled with a large bending angle to roughly remove the wrinkles, and the medium M with the roughly removed wrinkles can have the wrinkles further reduced with a small bending angle in the downstream bending portion 32. That is, with such a configuration, it is possible to suppress excessive wrinkle removal with a large surface pressure due to an overly large bending angle at one time, and effectively level the wrinkles generated in the medium M at the downstream bending portion 32 and the upstream bending portion 31. Therefore, with such a configuration, it is possible to particularly effectively suppress the occurrence of creases in the medium M.

[0036] Here, the bending angle Θ1 of the upstream bending portion 31 means the angle of the intersection of the straight lines connecting, in the upstream bending portion 31, the straight line from the upstream side in the conveyance direction A to the bending start position as viewed from the width direction B and the straight line from the bending end position to the downstream side in the conveyance direction A as viewed from the width direction B, as viewed from the width direction. Similarly, the bending angle Θ2 of the downstream bending portion 32 means the angle of the intersection of the straight lines connecting, in the downstream bending portion 32, the straight line from the upstream side in the conveyance direction A to the bending start position as viewed from the width direction B and the straight line from the bending end position to the downstream side in the conveyance direction A as viewed from the width direction B, as viewed from the width direction B.

[0037] In the liquid ejection device 1 of the present embodiment, the bending angle Θ1 of the upstream bending portion 31 is 144°, and the bending angle Θ2 of the downstream bending portion 32 is 132°. In the liquid ejection device 1 of the present embodiment, for example, the medium M with cockling generated between the head 5 and the upstream bending portion 31 forms substantially rhombic irregularities without wrinkling at the upstream bending portion 31, and the medium M with cockling generated between the upstream bending portion 31 and the downstream bending portion 32 forms rhombic irregularities again without wrinkling at the downstream bending portion 32. Here, the preferable range of the bending angle Θ1 of the upstream bending portion 31 is 141° or more and 144° or less, and the preferable range of the bending angle Θ2 of the downstream bending portion 32 is 129° or more and 133° or less. However, the present invention is not limited to such a range.

[0038] Also, as shown in FIG. 2, when the length of the upstream bending portion 31 in the conveyance direction A is L1 and the length of the downstream bending portion 32 in the conveyance direction A is L2, it is preferable that L1 > L2. By adopting such a configuration, the wrinkles generated in the medium M at the downstream bending portion 32 and the upstream bending portion 31 can be effectively smoothed, and in particular, the occurrence of creases in the medium M can be effectively suppressed. In particular, in the liquid ejection device 1 configured such that Θ1 > Θ2, by configuring it such that L1 > L2, it is possible to suppress excessive wrinkling with a large surface pressure at the upstream bending portion 31, and the wrinkles generated in the medium M at the downstream bending portion 32 and the upstream bending portion 31 can be particularly effectively smoothed.

[0039] Here, the length L1 of the upstream bending portion 31 in the conveyance direction A means the length from the bending start position in the conveyance direction A as viewed from the width direction B to the bending end position in the conveyance direction A as viewed from the width direction B at the upstream bending portion 31. Similarly, the length L2 of the downstream bending portion 32 in the conveyance direction A means the length from the bending start position in the conveyance direction A as viewed from the width direction B to the bending end position in the conveyance direction A as viewed from the width direction B at the downstream bending portion 32.

[0040] Incidentally, when the surface pressure is σ, the surface pressure σ can be expressed as σ = F / A, where F is the winding strength by the holding portion 6 and A is the area of the medium M supported by the support surface 30 at the upstream bending portion 31 and the downstream bending portion 32. Therefore, the surface pressure σ can be reduced by increasing the length L1 of the upstream bending portion 31 in the conveyance direction A and the length L2 of the downstream bending portion 32 in the conveyance direction A.

[0041] In the liquid ejection device 1 of the present embodiment, the length L1 of the upstream bending portion 31 in the conveyance direction A is 112 mm, and the length L2 of the downstream bending portion 32 in the conveyance direction A is 50 mm. Here, the preferable range of the length L1 of the upstream bending portion 31 in the conveyance direction A is 95 mm or more and 145 mm or less, and the preferable range of the length L2 of the downstream bending portion 32 in the conveyance direction A is 49 mm or more and 52 mm or less. However, the present invention is not limited to such a range.

[0042] Also, as shown in FIG. 1, in the liquid ejection device 1 of the present embodiment, the guide bar 100 is fixed to the downstream medium support portion 3C, or in other words, is supported by the downstream medium support portion 3C. With such a configuration, the liquid ejection device 1 of the present embodiment can arrange the guide bar 100 at a suitable position with respect to the downstream medium support portion 3C with a simple configuration. By arranging the guide bar 100 at a suitable position with respect to the downstream medium support portion 3C, the medium M conveyed while maintaining the contact state with the downstream medium support portion 3C can be guided, and the occurrence of creases in the medium M can be effectively suppressed.

[0043] Also, as shown in FIG. 1, in the liquid ejection device 1 of the present embodiment, the downstream-side medium support portion 3C includes a heater 20 that heats the medium M. With such a configuration, the liquid ejection device 1 of the present embodiment can evaporate the volatile components of the ink applied to the medium M in the downstream-side medium support portion 3C in a short time, thereby suppressing the swelling of the medium M. For this reason, the liquid ejection device 1 of the present embodiment can reduce the risk of wrinkles occurring in the medium M in the downstream-side medium support portion 3C, and can effectively suppress the occurrence of creases in the medium M.

[0044] The present invention is not limited to the above-described embodiments, and can be realized in various configurations without departing from the gist thereof. Also, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be appropriately replaced or combined in order to solve some or all of the above-described problems, or to achieve some or all of the above-described effects. Further, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Explanation of Reference Numerals

[0045] 1... Liquid ejection device, 2... Holding portion, 3... Medium support portion, 3A... Upstream-side medium support portion, 3B... Medium support portion, 3C... Downstream-side medium support portion, 4... Carriage, 5... Head (liquid ejection portion), 6... Holding portion (take-up portion), 7... Leg frame, 8... Roller pair, 9... Main body portion, 10... Air blowing portion, 11... Fan, 20... Heater, 30... Support surface, 31... Upstream-side bending portion, 32... Downstream-side bending portion, 33... Central portion, 100... Guide bar (contact member), 101... Contact surface, F... Airflow, L1... Length in the conveyance direction of the upstream-side bending portion, L2... Length in the conveyance direction of the downstream-side bending portion, M... Medium, M1... Image formation surface, M2... Supported surface, R1... Roll body, R2... Roll body, Θ1... Bending angle of the upstream-side bending portion, Θ2... Bending angle of the downstream-side bending portion

Claims

1. A liquid discharge unit that discharges liquid onto a medium, A winding unit that winds up the medium while applying tension in the conveyance direction, A medium support unit that supports the medium on a support surface downstream of the liquid discharge unit in the conveyance direction and upstream of the winding unit in the conveyance direction, A contact member that guides the conveyance of the medium while contacting at least a part of the medium wound around the winding unit at a contact surface, downstream of the medium support unit in the conveyance direction and upstream of the winding unit in the conveyance direction, and is curved such that the contact surface protrudes when viewed from a width direction intersecting the conveyance direction, comprising A downstream bending portion is formed downstream of the central portion of the medium support unit in the conveyance direction and is curved such that the support surface protrudes when viewed from the width direction, The liquid discharge device, wherein the medium is conveyed across from the downstream bending portion to the contact member.

2. In the liquid discharge device according to Claim 1, An upstream bending portion is formed upstream of the downstream bending portion of the medium support unit in the conveyance direction and is curved such that the support surface protrudes when viewed from the width direction.

3. In the liquid discharge device according to Claim 2, When the bending angle of the upstream bending portion viewed from the width direction is Θ1 and the bending angle of the downstream bending portion viewed from the width direction is Θ2, Θ1 > Θ2.

4. In the liquid discharge device according to Claim 2 or 3, When the length of the upstream bending portion in the conveyance direction is L1 and the length of the downstream bending portion in the conveyance direction is L2, L1 > L2.

5. In the liquid discharge device according to Claim 1 or 2, The liquid ejection device, wherein the contact member is supported by the medium support portion.

6. In the liquid ejection device according to claim 1 or 2, The liquid ejection device, wherein the medium support portion includes a heater for heating the medium.

Images